Answer:
The smallest bronchioles end in tiny air sacs, called alveoli. They inflate when a person inhales and deflate when a person exhales. During gas exchange oxygen moves from the lungs to the bloodstream.
Explanation:
Answer:
Passing a difficult math test!
Explanation:
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The opportunity cost of spending more money on finding a cure for heart disease is the money that needs to be taken out of funding to find the cure for other diseases.
